Mould for the manufacture of lightweight concrete blocks



y 19, 1964 c. G. B. BERGLING 3,133,333

MOULD FOR THE MANUFACTURE OF LIGHT-WEIGHT CONCRETE BLOCKS Filed May 11, 1962 I 2 Sheets-Sheet 1 May 19, 1964 c. G. B. BERGLING MOULD FOR THE MANUFACTURE OF LIGHT-WEIGHT CONCRETE BLOCKS Filed May 11, 1962 2 Sheets-Sheet 2 United States Patent 3,133,333 MOULD FOR THE MANUFACTURE OF LIGHT- WEIGHT CONCRETE BLOCKS Charles Gunnar Birger Bergling, Rostagatan 20, Orebro, Sweden Filed May 11, 1962, Ser. No. 194,105 Claims priority, application Sweden Sept. 3, 1959 1 Claim. (Cl. 25-419) This invention relates to a mould for the casting of light weight concrete masses of the type which has a bottom made of laths which are so arranged beside each other at such a mutual distance that a cutting wire can pass between two adjacent laths. The invention is principally intended to provide a mould, which can easily be assembled and which has a very high degree of accuracy.

The mould according to the invention is characterized in that the laths are situated on spacers, which are made with great accuracy and which are supported by transverse beams the top surfaces of which are worked with an accuracy corresponding to the desired levelness of the mould bottom, the spacers being joined with the laths and transverse beams by means of pivots and corresponding borings and the transverse beams being supported between longitudinal beams.

The invention will be explained more in detail with reference to the accompanying drawings in which:

FIG. 1 shows in perspective view a part of a mould bottom according to the invention,

FIG. 2 shows a vertical section parallel to the length of the laths, through the mould according to FIG. 1, and

FIG. 3 is a fragmentary section in a plane perpendicu lar to the length of the laths.

The device illustrated in the drawings consists of two longitudinal beams 1, which on the top side as well as on the underneath side are worked to a high degree of levelness and a number of transverse beams 2, which on the top sides are worked with high accuracy to a great levelness. The transverse beams 2 are, through arcuate working of the ends made to exact length. On their top sides the transverse beams are provided with a plurality of borings 9 which are spaced exactly in conformity with the module used for the finished light concrete blocks. The transverse beams 2 are welded or bolted to the longitudinal beams 1. In doing so the borings 9 in the transverse beams will form rows of holes in the length of the mould, which holes are in exactly straight lines. Spacing elements 3 which are all identically alike and which have been manufactured with a high degree of accuracy, and which have a shorter pivot 7 at one end and a longer, threaded pivot 5 at the other end, are now applied to the transverse beams 2 so that the longer pivots 5 engage the holes 9, and are secured to the beams by nuts 6. In the illustrated example the spacers have the shape of bobbin-like bodies which have been machined, for instance in a lathe, to a high degree of precision.

Mould bottom laths 4 are now placed upon the spacers 3 so that the upper, shorter pivots 7 of the spacers engage corresponding holes in the laths. The laths are secured to the spacers by means of screws 8. The width of the laths is so chosen that the distance between two adjacent laths is sufficient for passage of a cutting wire, by which the cast light-weight concrete block is to be divided. In use the openings between the bottom laths are closed in conventional manner, for instance by melted "ice parafiin wax, the side wall of the mould (not shown in the drawings) are then mounted, and a light-weight concrete mass is poured into the mould and is hardened in any ordinary way.

When the cast light-weight concrete block is to be divided with vertical cuts by means of cutting wires 11, the holders 10 for the bottom ends of the cutting wires 11 are inserted between the spacers 3 and the cutting wires 11 are drawn through the block. The holders 10 for the bottom ends of the cuttingwires 11 are able to travel below the laths 4 along the entire length of the laths 4 without being obstructed by the spacers 3, the spacing between the spacers 3 being suflicient for the movement of the cutting wires.

The transverse beams of the illustrated embodiment contain one series of borings for one particular module only. It is within the scope of the invention to provide in the transverse beams borings for two or more modules. By changing the laths such a unitary structure may easily be changed from one module to another.

This application is a continuation-in-part of my application Ser. No. 50,374, filed August 18, 1960 and now abandoned.

I claim:

In a mould for the manufacture of light-weight concrete, a mould bottom having a substantially plane upper surface adapted to be positioned in a substantially horizontal plane, said mould bottom consisting essentially of two spaced apart parallel longitudinal beams, the upper surfacesof which lie in a plane parallel to said horizontal plane, at least two spaced apart, parallel transverse beams secured between said longitudinal beams, the upper surfaces of said transverse beams lying in a plane parallel to said horizontal plane, said transverse beams being provided with spaced apart holes extending perpendicular to the plane of the upper surfaces of said transverse beams, each hole in each transverse beam being alined with at least one hole in another transverse beam in a line parallel to said longitudinal beams, a plurality of identical spacing elements each having a pivot projection at one end thereof extending through one of said holes and detachably securing said spacing elements to said transverse beams, said spacing elements being arranged in groups of at least two in lines parallel to said longitudinal beams, said lines being spaced from each other, each spacing element having a pivot projection at the other end thereof, a plurality of laths equal in number to the number of groups of spacing elements, said laths being provided with holes each of which is fitted over one of said pivot projections on said other ends of said spacing elements, whereby said laths are detachably positioned parallel to each other and to said longitudinal beams and substantially fill the space between said longitudinal beams, each adjacent pair of laths being spaced apart sufiiciently to permit the passage of a cutting wire therebetween and said groups of spacing elements being spaced apart sufficiently to permit the passage therebetween of holder bodies on the ends of said cutting wires.

References Cited in the file of this patent UNITED STATES PATENTS 2,465,276 Ryder Mar. 22, 1949 2,694,846 Olsson et a1. Nov. 23, 1954 2,881,503 Johnson Apr. 4, 1959 2,978,777 Carlsson et al Apr. 11, 1961 

